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FRI: Friday Contributed Sessions
FRI 11: Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems: Contributed Session to Symposium
FRI 11.1: Talk
Friday, September 12, 2025, 10:45–11:00, ZHG104
Observation of Floquet states in graphene — •Marco Merboldt1, Michael Schüler2, David Schmitt1, Jan Philipp Bange1, Wiebke Bennecke1, Karun Gadge3, Klaus Pierz4, Hans Werner Schumacher4, Davood Momeni4, Daniel Steil1, Salvatore R. Manmana3, Michael Sentef5, Marcel Reutzel1, and Stefan Mathias1 — 1Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — 2Department of Physics, University of Fribourg, Fribourg, Switzerland — 3Georg-August-Universität Göttingen, Institut für Theoretische Physik, Germany — 4Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 5Institute for Theoretical Physics, University of Bremen, Bremen, Germany
Floquet engineering – the coherent dressing of matter via time-periodic perturbations – is a mechanism to realize and control emergent phases in materials out of equilibrium. However, the broad applicability of Floquet engineering to quantum materials is in question, especially with respect to (semi-)metals and graphene in particular.
Here, we resolve this long-standing debate by using electronic structure measurements to provide direct spectroscopic evidence of Floquet effects in graphene [1]. We report light-matter-dressed Dirac bands by measuring the contribution of Floquet sidebands, Volkov sidebands, and their quantum path interference to graphene’s photoemission spectrum. Fully supported by experiment and theory, we demonstrate that Floquet engineering in graphene is possible.
[1] Merboldt et al., Nature Physics (2025)
Keywords: Ultrafast momentum microscopy; trARPES; Graphene; light-matter interaction; Floquet engineering